Zhang Meiran, Huang Ping, Zheng Wei, Song Xiaorong, Shang Xiaoying, Zhang Wen, Yang Dengfeng, Yi Xiaodong, Chen Xueyuan
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108, China.
Nano Lett. 2023 Sep 27;23(18):8576-8584. doi: 10.1021/acs.nanolett.3c02377. Epub 2023 Sep 8.
Lanthanide (Ln)-doped photon avalanche (PA) upconversion nanoparticles (UCNPs) have great prospects in many advanced technologies; however, realizing efficient PA luminescence in Ln-doped UCNPs remains challenging due to the deleterious surface and lattice quenching effect. Herein, we report a unique strategy based on the pyrolysis of KHF for the controlled synthesis of aliovalent Ln-doped KMgF UCNPs, which can effectively protect Ln from luminescence quenching by surface and internal OH defects and thereby boost upconversion luminescence. This enables us to realize efficient PA luminescence from Tm at 802 nm in KMgF: Tm UCNPs upon 1064 nm excitation, with a giant nonlinearity of ∼27, a PA response time of 281 ms, and an excitation threshold of 16.6 kW cm. This work may open up a new avenue for exploring highly nonlinear PA luminescence through aliovalent Ln doping and crystal lattice engineering toward diverse emerging applications.
镧系（Ln）掺杂的光子雪崩（PA）上转换纳米颗粒（UCNPs）在许多先进技术中具有广阔前景；然而，由于有害的表面和晶格猝灭效应，在Ln掺杂的UCNPs中实现高效的PA发光仍然具有挑战性。在此，我们报道了一种基于KHF热解的独特策略，用于可控合成异价Ln掺杂的KMgF UCNPs，该策略可有效保护Ln免受表面和内部OH缺陷导致的发光猝灭，从而增强上转换发光。这使我们能够在1064 nm激发下，在KMgF:Tm UCNPs中实现Tm在802 nm处的高效PA发光，具有约27的巨大非线性、281 ms的PA响应时间和16.6 kW cm的激发阈值。这项工作可能为通过异价Ln掺杂和晶格工程探索高度非线性PA发光开辟一条新途径，以用于各种新兴应用。
